Our economy is still marked by massive disruption: technological innovation isn't just limited to services. Process engineering, chemical engineering, astronomy, physics, linguistics, archeology, ... they're all experiencing disruption at an increasing pace. They all increase GDP.
To me, this is an indication that as we provide people with powerful tools, their minds expand to use those tools. The exponential feedback may become much more smooth (less "disruptive") but I think we're a long way from a local maximum.
The current economy still "feels" like an idling 2-stroke leaf blower to me. It sputters and races because its carburetor and ignition are, well, inefficient.
What would it take to get a jet engine-like economy?